中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.小敏在某次投篮中，球的运动线路是抛物线y=-
x2+3.5的一部分（如图），若命中篮圈中心，则他与篮底的距离l是（ ）
x2+3.5的一部分（如图），若命中篮圈中心，则他与篮底的距离l是（ ） | A: 3.5m |
| B: 4m |
| C: 4.5m |
| D: 4.6m |
一次做对，真牛！
+5奖励规则>
- 提示1：5b2TeT0zLjA15pe277yM5rGC5Ye65a+55bqU55qE5qiq5Z2Q5qCH77yM5LiOMi41beebuOWKoOWNs+WPr++8jg==
- 答案：Qg==
6Kej77ya5b2TeT0zLjA15pe277yMLTxpbWcgd2lkdGg9NyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9CNy9BNS9yQkFDRTFWMDkxWERPM0xNQUFBQkhrQTNuWU02NjAucG5nIj54PHN1cD4yPC9zdXA+KzMuNT0zLjA177yM6Kej5b6XeDxzdWI+MTwvc3ViPj0tMS4177yI6IiN5Y6777yJ77yMeDxzdWI+Mjwvc3ViPj0xLjXvvIw8YnI+4oi0bD0yLjUrMS41PTRt77yOPGJyPuaVhemAiULvvI4=
本课配套习题挑战模式2/5
单选题
难度系数：
2.向某一目标发射一枚炮弹，经x秒后的高度为y米，且高度与时间的关系式为y=ax2+bx．若此炮弹在第5秒与第12秒时的高度相等，则在下列4个时间点中炮弹高度最高的是（ ）
| A: 第6秒 |
| B: 第8秒 |
| C: 第10秒 |
| D: 第13秒 |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u6aKY5oSP5rGC5Ye65oqb54mp57q/55qE5a+556ew6L2077yM5Y2z5Y+v5b6X5Ye66aG254K555qE5qiq5Z2Q5qCH77yM5LuO6ICM5b6X5Ye654Ku5by55omA5Zyo6auY5bqm5pyA6auY5pe2eOeahOWAvO+8jg==
- 答案：Qg==
6Kej77ya4oi15q2k54Ku5by55Zyo56ysNeenkuS4juesrDEy56eS5pe255qE6auY5bqm55u4562J77yMPGJyPuKItOaKm+eJqee6v+eahOWvueensOi9tOaYr++8muebtOe6v3g9PGltZyB3aWR0aD0yOCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC84MS9GMi9yQkFDSmxWMDkxaWhPVldIQUFBQmdlZkZwSEU0OTcucG5nIj49OC4177yMPGJyPuKItOeCruW8ueaJgOWcqOmrmOW6puacgOmrmOaXtu+8muaXtumXtOaYr+esrDjnp5LvvI48YnI+5pWF6YCJQu+8jg==
本课配套习题挑战模式3/5
单选题
难度系数：
3.如图是抛物线形拱桥，当拱顶离水面2m时，水面宽4m，则水面下降1m时，水面宽度增加（ ）
| A: 1m |
| B: 2m |
C: (2 -4)m |
| D: (-2)m |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u5bey55+l5b6X5Ye655u06KeS5Z2Q5qCH57O777yM6L+b6ICM5rGC5Ye65LqM5qyh5Ye95pWw6Kej5p6Q5byP77yM5YaN6YCa6L+H5oqKeT0tMeS7o+WFpeaKm+eJqee6v+ino+aekOW8j+W+l+WHuuawtOmdouWuveW6pu+8jOWNs+WPr+W+l+WHuuetlOahiO+8jg==
- 答案：Qw==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.某厂大门是抛物线形水泥建筑，大门地面路宽为6m，顶部距离地面的高度为4m，现有一辆装载大型设备的车辆要进入厂区，已知设备总宽为2.4米，要想通过此门，则设备及车辆总高度应小于（ ）
| A: 2.66米 |
| B: 2.60米 |
| C: 3.36米 |
| D: 2.58米 |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u6aKY5Lit5pWw5o2u5YGH6K6+6YCC5b2T55qE6Kej5p6Q5byP5bm25rGC6Kej77yM5Y+I5Zug5Li6Mi4057Gz55qE6L2m5LuO5Lit6Ze06L+H77yM6L2m5Lik6L6555qEeD0xLjLvvIzku6PlhaXop6PmnpDlvI/ljbPlj6/msYLlvpfovabovobpq5jluqbvvI4=
- 答案：Qw==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
在今年的校运动会中，小明参加了跳远比赛，重心高度h（m）与时间t（s）的函数解析式为h=3.5t-4.9t2，可以描述他在某次跳跃时重心高度的变化（如图），则他起跳后到重心最高时所用的时间是（ ）
| A: 0.36s |
| B: 0.63s |
| C: 0.70s |
| D: 0.71s |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5om+6YeN5b+D5pyA6auY54K577yM5bCx5piv6KaB5rGC6L+Z5Liq5LqM5qyh5Ye95pWw55qE6aG254K577yM5bqU6K+l5oqK5LiA6Iis5byP5YyW5oiQ6aG254K55byP5ZCO77yM55u05o6l6Kej562U77yOPC9wPg==
- 答案：QQ==
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
